US Bridges

River RD over Hart CR

Fair

Boone County, Missouri · S 7 T 45 N R 12 W · Structure no. 23328

Built
1980
45 years old
Condition
Fair
inspected December 2024
Type
Tee Beam
Prestressed Concrete
Length
81 ft
2 main spans
Daily traffic
30
2023 count
Owner
County
County Highway Agency

About this bridge

River RD over Hart CR is a prestressed concrete tee beam carrying River RD over Hart CR in Boone County, Missouri. It was built in 1980, so it is 45 years old, younger than the Missouri average of 45.1 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 30 vehicles a day, roughly 10% of them trucks, projected to reach 57 by 2043. The structure is 81 ft (24.7 m) long and 23 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesRiver RD
CrossesHart CR
LocationS 7 T 45 N R 12 W
RouteCounty Highway 403
CountyBoone County
StateMissouri
Coordinates38.69186, -92.31697
Functional classRural Local

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating68.5 US tons
Inventory rating42.7 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length81 ft (24.7 m)
Longest span40 ft (12.2 m)
Deck width23 ft (6.9 m)
Roadway width22 ft (6.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30 (2023)
Projected traffic57 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was River RD over Hart CR built?

It was built in 1980, making it 45 years old in 2025.

What condition is River RD over Hart CR in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in December 2024.

How much traffic does River RD over Hart CR carry?

About 30 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is River RD over Hart CR?

The structure is 81 ft (24.7 m) long with a longest span of 40 ft (12.2 m) and a deck 23 ft wide.

Who owns River RD over Hart CR?

It is owned by the County Highway Agency.